Collaborative Research: Cosmic Ray Feedback from Plasma to Circumgalactic Scales

合作研究：从等离子体到银河系尺度的宇宙射线反馈

基本信息

批准号：
2009227
负责人：
Mateusz Ruszkowski
金额：
$ 33.6万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009227&HistoricalAwards=false
关键词：
Collaborative Research Cosmic Ray Feedback

项目摘要

The self-regulation of star formation through feedback, the launching of galactic winds, and the interactions between galaxies and their circum-galactic medium, are fundamental and interrelated components of galaxy formation and evolution. The primary agents of feedback are the thermal and turbulent energy of interstellar gas, radiation, and magnetized cosmic rays. Cosmic rays exchange momentum and energy with the background medium and may be better coupled to the ionized gas than are the photons, but the physical and computational tools needed to include them in galaxy models are still at an early stage, and have not yet been fully studied. This project addresses this “cosmic ray gap” by developing and implementing new tools for studying the plasma physics of cosmic rays as it applies to star formation feedback. The team will organize outreach events to improve general scientific literacy, including planetarium shows and public lecture series. Undergraduates and graduate students will be involved in all aspects of the research, providing broad professional training. Workshops will foster collaborations among participants who share closely related interests in the physics of cosmic rays, magnetic fields, and interstellar and intra-cluster feedback.The collaborators have complementary and overlapping expertise in plasma astrophysics theory, computational astrophysics, cosmic ray physics, and the astrophysics of galaxy evolution. This study will cover processes on length scales from the sub-AU microscopic plasma scales to the 100 kpc circum-galactic scales, and will combine state of the art fluid dynamical and hybrid fluid–kinetic numerical simulations with analytical theory. The research goals include: (1) find improved prescriptions for including cosmic rays in models of stellar feedback; (2) quantify an “Eddington Limit” for the cosmic ray flux necessary to unbind the interstellar gas in a galaxy; (3) construct models of the circum-galactic medium that include cosmic rays; (4) make predictions for observational tests of the role of cosmic rays. For comparison with data, the investigators will calculate the non-thermal gamma-ray and radio synchrotron emission from models with cosmic rays; the gamma-ray results will be used to interpret observations with Fermi.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

通过反馈，银河风的发射以及星系及其圆与半乳酸培养基之间的相互作用的自我调节是星系形成和进化的基本和相互关联的组成部分。反馈的主要试剂是星际气体，辐射和磁化宇宙射线的热和湍流能量。与照片相比，宇宙射线交换动量和能量与背景培养基的交换动量和能量可能更好，但是将它们包括在星系模型中所需的物理和计算工具仍处于早期阶段，并且尚未完全研究。该项目通过开发和实施新工具来研究宇宙射线的等离子体物理学，以解决该项目的“宇宙射线差距”。该团队将组织外展活动，以提高一般科学素养，包括天文馆表演和公开演讲系列。本科生和研究生将参与研究的各个方面，提供广泛的专业培训。讲习班将促进在宇宙射线，磁场和星际群体和群集内反馈中具有密切相关兴趣的参与者之间的合作。合作者在血浆天体物理学，计算天体物理学，宇宙射线物理学以及天体物理学的互补和重叠的专业知识中具有互补和重叠的专业知识。这项研究将涵盖从子AU显微镜等离子体量表到100 kpc圆柱状量表的长度尺度的过程，并将最先进的流体动力学和杂化流体 - 运动数值模拟与分析理论相结合。研究目标包括：（1）找到改进的处方，以在恒星反馈模型中加入宇宙射线；（2）量化在银河系中未连接星际气体所需的宇宙射线通量的“爱丁顿极限”；（3）包含宇宙射线的圆周循环的构造模型；（4）对宇宙射线作用的观察性测试进行预测。为了与数据进行比较，研究人员将计算出具有宇宙射线模型的非热伽马射线和无线电同步发射。伽马射线结果将用于解释使用Fermi的观察结果。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来支持。